\documentclass[a4paper,12pt]{article}
\usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}
\usepackage{tikz}

%\title{Ti$k$Z reference}
%\author{Yi-Chen Zhang}
%\date{\today}

\begin{document}
\begin{center}
	\textbf{\Large Ti$k$Z reference (advanced)}\\
	\bigskip
	Yi-Chen Zhang\\
	\smallskip
	\today
\end{center}

\end{document}
